Makita 412049-2 — Genuine Makita piston ring (Piston Ring 40). Precision-formed ring with a nominal 40 mm designation that seals the piston in the hammer mechanism to restore proper compression and impact performance.
Compatibility: commonly used in Makita demolition/rotary hammers such as HM1200 / HM1200B / HM1200K and HR5000, HR5000K . Check your tool’s parts diagram to confirm the position and quantity required.
What you’re getting: a single, original Makita replacement piston ring (part no. 412049-2) sized for the piston assembly (marked “Piston Ring 40” in Makita parts lists). Replacing a worn, cracked or deformed ring will stop loss of impact, reduce blow‑by and restore consistent hammering action — install into the piston / striker assembly as per the diagram and ensure proper lubrication of mating parts.
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